<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0px;
            padding: 0px;
        }

        .scroll {
            width: 100%;
            height: 500px;
            background-color: burlywood;
            position: relative;
        }

        .left {
            width: 200px;
            height: 300px;
            background-color: green;
            position: absolute;
            top: 50px;
            left: 50px;
        }

        .cen {
            width: 350px;
            height: 50px;
            background-color: pink;
            position: absolute;
            top: 50px;
            left: 450px;
            /* border-radius: 50%; */
            border-top-left-radius: 10px;
            /* border-top-right-radius: 20px; */
            border-bottom-right-radius: 30px;
            /* border-bottom-left-radius: 40px; */
        }
    </style>
</head>

<body>
    <div class="scroll">
        <img src="imgs/back.jpg" width="100%" height="100%">
        <!-- 左边导航 -->
        <div class="left"></div>
        <div class="cen"></div>
    </div>

</body>

</html>